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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05abbd0c49d58512e9673e2d10d5d97d67fa39233ffcf871c595b2d37c47c71' 
  AND token = 'bO10arc3804YJAKEKpHAgEvKjr57mo234b5LcH5iKLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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