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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3fd1944bf05bd1e9f516b52a962176d503cc2ccf49e9109a8cafc99aebf942' 
  AND token = 'lN7euTUZmiKvBJ8VY/YL+YSD2JAEUGuib/F/2cykcRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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