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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c031e3bfd0b0adaec8cef451a69b6f1cd89853dd580f8be8047c8f34e96b7b' 
  AND token = 'u1iX0Rj9BpROIA3oeJGnEOwlRmk+dnk/sD75Z5VLNhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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