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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34f3ce980f0d28d5a64f00cc4f1352e526776ab91782752c608d58b4ab882cf' 
  AND token = '+3cCbG+ynDo64z13WwyHMTd9DRy2w8u/L97eShNqacc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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