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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76462cbc852c40a128dd3a42918d899a783ae3f8ffd49a8503f5c636dce039d6' 
  AND token = 'FSi0QlaRG6HX0idkuvyhAE5yYHzjC8guWOlbH2prvFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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