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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2370162389639961ac2877c878b446a1af23fe9ffcbe2a177aec354343631c80' 
  AND token = 'j2u9rJyIyJX8XuSywmQfOve8oqtPptKn0GwHdpJh8dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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