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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d92f174f2c3dbd436a4794baad107b1eb12413089f489d6ec4cca523f0cc48' 
  AND token = '6+1pkNeXC1zLcMwz9CU7D3LblkuDEq814wqhShXeePs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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