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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913c6d6ec5ccfd94ad03c73f72086489eeeee1ecdd989b68fea8062cabef59dd' 
  AND token = '+S1ttFf0VmxOuX3BiA1lNoamYIXwNuen9Zk7AhKe7Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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