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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d118fcaca29ccc4691bab5520f45c9f81f47f8a458d22c4b1f4755823019f0b' 
  AND token = 'tVGbXFyDjRxW25zy2ukR2q2M4gNCjNRXdIbNYcKLpJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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