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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9af1c5c26c4dfc8c59035fa3d87b0db22408b689ab070d912f3b942922ed902' 
  AND token = '1zMgIwBggcuEis1MjEyO4b4f2ffHXYc3ulkL42lh7JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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