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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a91577b4c78ddb7c7b68ed9471975439dda34e94a0c02d65c30c02d83a45f3' 
  AND token = 'QB9Yc9fT+UlcpA6yMh20ms2/8452K1eygaIwk8KHPGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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