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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae247abe63366a8e2db90412f23121fa489da81bee05b7a010d9eaa7b0c4fe11' 
  AND token = 'm2NKFlwgrILHJ6doPETHduAMX8HnV2s8N3jn8QCWH0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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