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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c52850282a058a05237fb83e42a2a18f5fb5d18fd49f1998fc7bef8bd6913a' 
  AND token = 'KtHFfhOGjOZNaAEG5fNLGQ3WxqNd1Gn4iSXnsp4ThVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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