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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b44be70a1499bef7eaab3cf749fd1c3eb2c7eae1dbf5855316936cc952ebee5' 
  AND token = 'Uy4mzwddIyq38FTY0k+37lS29pHnn5cjYmT82wc9XY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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