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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03c88db3be08a0fab1dbce2c51e0a0f2621f7b8ad5df105a93eec01d74f851e' 
  AND token = 'VhcVcA4W5At5FirgPiQMZjwX/PMbSJGN1qcuUmOFVIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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