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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f913df70ca13b5a7ad7da260d5af1e77393af71f641c8f498a9fd838f6b029be' 
  AND token = '5F2349cKObs7NPmkdazH4JxTifeInao2UHi+lQcDKIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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