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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000c544030eff57c57e4c09943301e0f5dee23f4ec4990c1ff4b0bbbdc789a08' 
  AND token = 'd/gF4yyIos1zJgv3Aw4vcVcjw54sKL/JFcTgtuBoYrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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