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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e512f52ee5b03a69f6ff4834b2bba3987f67472a0c4ed1dd355b5078e9703609' 
  AND token = 'N2Wm7KRn8X+y7wr1sL5guHNokwsitdt2BHk6n950zgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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