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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6520af12e329af7bbb218956b37a6817288ae2c3955436e0e3133b9c0dce01d0' 
  AND token = 'UFXVlzwTBlXRjfXP3TyiPazxn5nf3Ks6VE1Yo/9emfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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