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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dc2262ef12bb4a244ddb5bfd7d05bec2a061abc7564b8c6ede02e9c39269a5' 
  AND token = 'kiNlaqFuv02rQVT55uOdyLAraumZfBl6TJbt0z5FhbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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