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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241c7fd0ce5f9a634e6bfe4ef6488b6cf28bb655cbfe5e0501a3b8747cbe4f57' 
  AND token = 'inDFdt3mOvGe+rljVYLIKzDASvnwPCYXaPcsYDD24+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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