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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e4e947d54a632d40ed7fde944a2aeb3b8df38901e4f4cbf2b2dfd319199d44' 
  AND token = '1qe/46f8hkScTBIUG8sTKmj+obt2VrpKerVmtCg/xvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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