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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8029778f746775c5b16fbf6e815df2b0470758602f677e95a99c43a348f7d72' 
  AND token = '9k0DNol5otIgOGA147n3NW6dqIORGB1qeL84SrgjPqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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