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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd570f4cbb5f04d45e6662c80778709f234c4007767a65f74f3bcb55aff8c3de6' 
  AND token = '7pSn8cX1GTUxwvcsazsLlyPsS60jI4AOBN9PrOJro7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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