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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b143c0d1a996cc0bd6f7e18b1fb18d0273b79d899d2b00d1a8edec7e361633d' 
  AND token = 'UnL0395c/w3F5/BE13kRRdkJShsNVBOFjVqoGBKUWVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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