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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20498e6fd03efd5db741cd9279221ea44f9562622e8581c82ffc4370ccb10cf8' 
  AND token = 'u6A4+3JRJ87cPBVdP0FjJWHNeI5JSy/SO4O0O+XbIW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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