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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc046f9ec32f008aafb97f3d130dcb8e2a706102cf3af72eda2cc12f000e659' 
  AND token = 'i3lEPjqh4MH68xELYvkS1n4m3wcJGpodbVeeEaI61mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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