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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa199d756162777ef89fe018bf8ef30a20bbb32e8a6be3f94dfb6285891f95c0' 
  AND token = '0ha/6Om97M1yZjY4K3KzkQ2xPeCacoLZ8hfSFjKEtic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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