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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6b863b14cca3a855c881850b0700922c5cae14963929a57860389280df581c' 
  AND token = '7ckc9ryK4dUq0u4+6yFWq+3TNjd4EvxD+huV1GtKwQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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