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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3f38002a005beef8bfbc783510aaf7408c1357ce95273387a7fe639e24d6d9' 
  AND token = 'nHNSkdcMaH3O4zx9uz14VEnidYq6H9bVMWY167T+ji4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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