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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dcf0fe093309f191b3aef642f8c96adc7a9c562457854e210f0fed887e6e67' 
  AND token = 'si9Qi6Ic2TR2bm5DTQDsOD8AOruIePMiYKSSq1/P8/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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