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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90af3ff8db1bbd5fcc445e5f52209162c67e0537e90900b0a14968a01b4f692a' 
  AND token = 'qc5s3Rm9/t19za7DNrjLxtaeiyOEpz0M2hMnWVLRuOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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