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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44aeb0bdcdda629d0f3084c6b5b43a4978747ed43d88e8ef960043a10618b33' 
  AND token = 'eiPSlVSlIepVCYkBaMI6YmvRlxS0Aq8MH636JrS0dGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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