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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3130eaab261023fa3a0fe63dfa3d33a104dc9635f62ce325b378e2682cd27a' 
  AND token = 'OhtSVDl/lZ0cB+2L0VR1mg0oFz9sfDMfBWsT12RJbE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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