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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4081f831052ad7686d0bf8ad7f9ffb4ea770310ec14695def482247dcc9c8f10' 
  AND token = '5PsHtj+Begbg4aBzd2NB6tfuIdCfq7Y1CJQtEWvWHr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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