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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f8f6477f289c3c26a18dec5a71dbc8bdeca84e918c996340d7c1e18c1cee77' 
  AND token = 'NwEvpzQGJ2sH9efbKqNYU9Vj+PEjCWWi/Po8z7OLTe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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