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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556ce415d6043354cd74f63b4b5df2b67d66cbd4975b46ca772a25e3f8d01a4a' 
  AND token = 'NzueVSi0XUG8nmiUKFwr5sgcdePmZfbCo9+lWkQIV20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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