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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b61da7adf2b19a356260b4e3666ee8600385e86bf6bb181eee68ba6f7b5ff67' 
  AND token = 'u9Ai4tzy3ObUr202AYHgLWTEOeb474knrXznZNyLLTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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