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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b3b6b1dbb97862bfe88b22a9e1e420233b7e5c523216eec2afa4e3292342e6' 
  AND token = 'QGSztODSJK8sK+ouGGMBIO+8mLcEH+8jA7d3vvK2hyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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