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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a50e9695bcae0cd4a49bb45bcd5b4a4a12259a197fe84888f88d4b68eca8ea' 
  AND token = 'B2S2qgo5Kflw6dv53vrQH3pTcf8YBzvgB5uLJGK6vcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}