SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73bf5f0c0919c3a5a442a0166880b70a36bb379577b2d4b1d4239c00c99cb2d' 
  AND token = 'O8rtqgKkWBMfBzpz81suV5wQ72R03uFj5v6vZx6zvrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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