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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5435d789efb90fe80f53ad7136f342a096f7ea9f8c50db13c9303b730de5da' 
  AND token = 'PSVuQ588/qXb/9Cn/NXkp/pXMvGq6ZdA24cudgfE8EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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