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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b944703598f4d2935ea85964a4c5d1c3b0baada26d185369722b44b1b23b8f' 
  AND token = 'X4QDZlDaDKh59UE5P0HzGRg07d2m8/t/aWb0W0yFDGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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