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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66e8fa4a3586276f19a4db32e27d6179ecc70a9ebb2e3e36580a4af7a5c0a9f' 
  AND token = 'bkZLdWVb26J3bv8/DgQUrP6UkU+89uyDqTe59Q7tUeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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