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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa740aa0cb42e539a081a0a42a0a6304fabf99a512153454ce2e5d4faf85041' 
  AND token = 'OL/+1kNFvjl24KroUPTIUyLyW4Q5NPclTGZmw4CSzSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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