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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18db48074b0ade2d65fe9aa7025b723efffb7149884def7ced8e0a1f3c03de46' 
  AND token = 'gnRlVbKwxnygxfhyeDl9Jj/EiVg6MBzsses1KieizrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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