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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215616ae3d4690c6ebfa9a70c2898d26372bdf394901baeeffd3d74be4d9e0ad' 
  AND token = 'tCbq+umk36kqMlNnQ+e9IETvyduyVSWeJY4X8NF+yZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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