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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924d083336a3b1348473b636643de9c14e1f11bc1f8208b9581e5ba6c2a0c8aa' 
  AND token = 'u+/BXa3iORnabLi39n7ga1un0t/ViElrk0/Kyt5f63A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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