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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7f9c09f0c3b4a65db772bc9583511c601e35e6b04c707c9d1a6aed2c34f5b4' 
  AND token = '/NjQH8bH2Q7OypYwNJk8qYRjfeEtB8ETJuUWsj++tHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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