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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b719a0b48cfc83d74a9c2af408d6c8b71bc11100caf9908887ea66bd292f06' 
  AND token = '7miThK3fhLewk/tZuhIa2fXqLFuX69NwOmDPcXDHtJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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