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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401c0e8b9b81a0b9da8d8e1e5a57a2bd474196f5a8d92c719ba25f03bc37bbc0' 
  AND token = 'N7cstHVyjd37UTN6fZextE0ljKNuHuZivUi0O6zxYB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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