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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e676562a5870c807eb83a6487267c4ad0cb55ee96101a72da8e9629d8a6d8c' 
  AND token = 'Ikt/SKMXk/s8OE8q3GBftL5Z7w7zAxjQ5WbdGCc+bA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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