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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352e19c43009af97ee5e03545c6d9d2611151cd4874c6206004a7882ffc32ea8' 
  AND token = '9RviVDl+d7dxWvhTazwYw37UunYXSLHsIHDLS6X1FBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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