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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12daaedc63b61c3c40d50a77cb59bee57f5766c4d4c2033284fafd7924488f5' 
  AND token = 'Hs47Ukl2yrklOPlQ1ZbYqHFVzdZ0oBkY0LqW1OTsrBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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