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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f18a6d4bff5ce73a6cbfabfd78cc5917e91b19ca63147c2e2c4bfabebae6f0' 
  AND token = 'JHjrNtKeBjY/eH3nSW5HW40XdLMFeMxF8uAQ+wuxRQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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