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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46349f4ad7c619aea90ee14b9f061d6bf9ffd7a3ec6b37bf1410c4812496bcb9' 
  AND token = 't0JDQx1WhmtYAK5lUcMK3vDHQVYWSIlHR/B3BTltxz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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