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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9233f832e51500095fc3a478a64ad7162c3246d619cfcf202db71f25dd074999' 
  AND token = 'Pv5+383/LUKzweHTkmwT7g988LFozXme+9/y42qUnGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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