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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30387e40ecb1b8e0d227311c9a77f2614640323c3d4ec07ad4297aa414a050c3' 
  AND token = 'sftW200RmWaQ8qJ6t+WigxDhzpI4dDxYgF6NeyNZGUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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