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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e8079cdb1ec5f1e908b8d532b1521bcbcaad451d0dc5b694e3b0d62b4d74fa' 
  AND token = 'BUJ/NKiQk/U4rq9QTa0o7J/UBV/FI8Wmr3dNx/T5VlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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