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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5af33b42556ea288cff31fd2437df5faf1afeb31a86dc79909196768ca4cad3' 
  AND token = 'aqtjbFFvNtJ8XJhAHJzDkboJtc/X25VoofX6P4aM38A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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