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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724dc4e373070c5410ac6fc91056beea6da2e66d446e7250e00d706ca690d78c' 
  AND token = 'z1XvdBSV3uCfA4Q9PhNwC4HeRQyKbXCiJ+eYnLDo9gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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