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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e64f0fb1dab968cc573d77d304e9413eeaed9a2fb12e82c53045969bf82623' 
  AND token = 'LXtQCzX00P2zfhDQ9ZFX7tmRh2dxO/XFEIEp+jFtf8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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