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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc831003386c0352b76a1b173a20fd22d0401b50644ca5176c0cbf594dcd6511' 
  AND token = 'tCFS+gWi8grWk/SHHnwiEN8yin7Ux0r+VX2cWh1EncU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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