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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d494a129e05e7dcc10b709f6f90f0cd8a4c7493296352b5655c3ac3cb0d1673' 
  AND token = 'Esy/EUYpo1DIospKD7djqkz5hiX1uOt3Ln4Ip9R651g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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