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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91655386dde712ee7c2d1f8f84428ad6967521330524e64eb84451463aa0a929' 
  AND token = 'r6wlxSGWc1ju3v8JcqqJN4SPoc9A7yQX+7dfp7MBys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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