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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d11fa8039c7e865ff5a9bec2562de8aa4d1ec3ff49f4fd87068e0527397f9b0' 
  AND token = 'l5wDFxJImLKabjOnL7rXmCxmZ+tcteWb/wlakA1P4PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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