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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de8d5142072658b092b38b741b61db962bbfdee49111a1ca271b0b635b76d5f' 
  AND token = '2HkkuNtrl0zBDiluDiL1Wh89lE2Hd6xfNo8U5WG6gGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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