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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b070dc43fafa4598d899e22496b1a13b5bcbf49ea7d8dd0868fd90e8d28760' 
  AND token = 'SNOEIt8oZfVunqeG5WPqU5wxZz8CngTUoZioG4LywQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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