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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd823369b2fd4a02d0792f8c69374fcebbc4a8d07f99ab74468ae5cb89a5c4742' 
  AND token = 'Oh2pN0EmZSNbbR6CK5nhMDWOcCHzJfzYYdt2U9yiIKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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